单项选择题

The best title for this selection would be:________.

A．Concrete and Its Uses
B．Rules for Working with Concrete
C．Concrete, the Homeowner's Joy
D．Concrete, a Test of Character
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单项选择题
A human quality apparently not essential in someone who works with concrete is________.
A．carefulness
B．patience
C．self-control
D．inventiveness
单项选择题
What does the passage mainly discuss
A．The increase of private mail service.
B．A comparison of urban and rural postal services.
C．The development of government postal system.
D．The history of postage stamps.
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